Looking for Ferguson and McAinsh families

I'm also researching the Ferguson and McAinsh family for a friend. William Robertson Ferguson was born on 9th May 1899 at Milnquarter Cottage, Bonnybridge, Stirlingshire. He married Margaret Docherty on 27th August 1920 in Broomhill House, Bonnybridge, Stirlingshire. William's parents were Duncan Ferguson McAinsh born 30th April 1865 in Uphall, West Lothian and Mary Bellingham born 14th February 1866 in Camelon, Falkirk, Stirlingshire. Duncan and Mary were married on 22nd January 1886 in Bonnybridge. Duncan died on 28th July 1939 at Broomhill House in Bonnybridge. He worked as a brickwork foreman. Mary died on 29th June 1943 at 31 Broomhill Road in Bonnybridge and she worked as a brickworker.
Duncan's parents were William McAinsh born Dunblane 1839 and Margaret Robertson born around 1842 in Edinburgh. William and Margaret were married on 16th January 1863 in Ecclesmachan Manse in West Lothian.
Mary's parents were David Bellingham born around 1839/1841 in Ireland and Martha McHugh born 23rd July 1842 in Culmore, Antrim, Ireland. David and Martha were married in Falkirk on 30th October 1859.